From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757667Ab2EAABY (ORCPT ); Mon, 30 Apr 2012 20:01:24 -0400 Received: from mail-qc0-f180.google.com ([209.85.216.180]:55516 "EHLO mail-qc0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757383Ab2EAABW (ORCPT ); Mon, 30 Apr 2012 20:01:22 -0400 X-Greylist: delayed 345 seconds by postgrey-1.27 at vger.kernel.org; Mon, 30 Apr 2012 20:01:11 EDT From: Frederic Weisbecker To: LKML , linaro-sched-sig@lists.linaro.org Cc: Frederic Weisbecker , Alessio Igor Bogani , Andrew Morton , Avi Kivity , Chris Metcalf , Christoph Lameter , Daniel Lezcano , Geoff Levand , Gilad Ben Yossef , Hakan Akkan , Ingo Molnar , Kevin Hilman , Max Krasnyansky , "Paul E. McKenney" , Peter Zijlstra , Stephen Hemminger , Steven Rostedt , Sven-Thorsten Dietrich , Thomas Gleixner Subject: [RFC][PATCH 00/41] Nohz cpusets v3 (adaptive tickless kernel) Date: Tue, 1 May 2012 01:54:34 +0200 Message-Id: <1335830115-14335-1-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.7.5.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, A summary of what this is about can be found here: https://lkml.org/lkml/2011/8/15/245 Changes since v2: * Correctly handle update of the cpuset mask when the nohz flag is set (courtesy of Hakan Akkan) * Handle rq clock. This introduces a new update_nohz_rq_clock() helper that sites which make use of rq->clock can call if they want to ensure the rq clock doesn't have a stale value due to the targeted CPU beeing tickless. If it's tickless, it's not maintaining the rq clock by calling scheduler_tick()->update_rq_clock() periodically. I think I've added this manual call to every callsites that needed it. I may have missed some though, or we may forget to handle tickless CPUs in future code. So I think we need to add some automated debug checks to catch that. * Fix a warning reported by Gilad Ben Yossef: we flush the time on pre-schedule and then the tick is restarted from an IPI before we do it manually on post-schedule. From there we try to flush the time again but ts->jiffies_saved_whence is set to SAVED_NONE because we already flushed the time. This was triggering a spurious warning. Still a lot to do. I'm now maintaining the TODO list there: https://github.com/fweisbec/linux-dynticks/wiki/TODO The git branch can be fetched from: git://github.com/fweisbec/linux-dynticks.git nohz/cpuset-v3 Frederic Weisbecker (40): nohz: Separate idle sleeping time accounting from nohz logic nohz: Make nohz API agnostic against idle ticks cputime accounting nohz: Rename ts->idle_tick to ts->last_tick nohz: Move nohz load balancer selection into idle logic nohz: Move ts->idle_calls incrementation into strict idle logic nohz: Move next idle expiry time record into idle logic area cpuset: Set up interface for nohz flag nohz: Try not to give the timekeeping duty to an adaptive tickless cpu x86: New cpuset nohz irq vector nohz: Adaptive tick stop and restart on nohz cpuset nohz/cpuset: Don't turn off the tick if rcu needs it nohz/cpuset: Wake up adaptive nohz CPU when a timer gets enqueued nohz/cpuset: Don't stop the tick if posix cpu timers are running nohz/cpuset: Restart tick when nohz flag is cleared on cpuset nohz/cpuset: Restart the tick if printk needs it rcu: Restart the tick on non-responding adaptive nohz CPUs rcu: Restart tick if we enqueue a callback in a nohz/cpuset CPU nohz: Generalize tickless cpu time accounting nohz/cpuset: Account user and system times in adaptive nohz mode nohz/cpuset: New API to flush cputimes on nohz cpusets nohz/cpuset: Flush cputime on threads in nohz cpusets when waiting leader nohz/cpuset: Flush cputimes on procfs stat file read nohz/cpuset: Flush cputimes for getrusage() and times() syscalls x86: Syscall hooks for nohz cpusets x86: Exception hooks for nohz cpusets x86: Add adaptive tickless hooks on do_notify_resume() nohz: Don't restart the tick before scheduling to idle sched: Comment on rq->clock correctness in ttwu_do_wakeup() in nohz sched: Update rq clock on nohz CPU before migrating tasks sched: Update rq clock on nohz CPU before setting fair group shares sched: Update rq clock on tickless CPUs before calling check_preempt_curr() sched: Update rq clock earlier in unthrottle_cfs_rq sched: Update clock of nohz busiest rq before balancing sched: Update rq clock before idle balancing sched: Update nohz rq clock before searching busiest group on load balancing rcu: New rcu_user_enter() and rcu_user_exit() APIs rcu: New rcu_user_enter_irq() and rcu_user_exit_irq() APIs rcu: Switch to extended quiescent state in userspace from nohz cpuset nohz: Exit RCU idle mode when we schedule before resuming userspace nohz/cpuset: Disable under some configs Hakan Akkan (1): nohz/cpuset: enable addition&removal of cpus while in adaptive nohz mode arch/Kconfig | 3 + arch/x86/Kconfig | 1 + arch/x86/include/asm/entry_arch.h | 3 + arch/x86/include/asm/hw_irq.h | 7 + arch/x86/include/asm/irq_vectors.h | 2 + arch/x86/include/asm/smp.h | 11 + arch/x86/include/asm/thread_info.h | 10 +- arch/x86/kernel/entry_64.S | 12 +- arch/x86/kernel/irqinit.c | 4 + arch/x86/kernel/ptrace.c | 10 + arch/x86/kernel/signal.c | 3 + arch/x86/kernel/smp.c | 26 ++ arch/x86/kernel/traps.c | 20 +- arch/x86/mm/fault.c | 13 +- fs/proc/array.c | 2 + include/linux/cpuset.h | 29 ++ include/linux/kernel_stat.h | 2 + include/linux/posix-timers.h | 1 + include/linux/rcupdate.h | 8 + include/linux/sched.h | 10 +- include/linux/tick.h | 75 ++++-- init/Kconfig | 8 + kernel/cpuset.c | 141 +++++++++- kernel/exit.c | 8 + kernel/posix-cpu-timers.c | 12 + kernel/printk.c | 15 +- kernel/rcutree.c | 150 ++++++++-- kernel/sched/core.c | 112 ++++++++- kernel/sched/fair.c | 39 +++- kernel/sched/sched.h | 29 ++ kernel/softirq.c | 6 +- kernel/sys.c | 6 + kernel/time/tick-sched.c | 542 +++++++++++++++++++++++++++++------- kernel/time/timer_list.c | 7 +- kernel/timer.c | 2 +- 35 files changed, 1148 insertions(+), 181 deletions(-) -- 1.7.5.4